Strange roundish pyreno - Forum ASCOFrance

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Strange roundish pyreno

Enrique Rubio, 26-09-2012 20:25

Dear friends:

Have you some idea about this strange roundish, densely gregarious,
uniperitheciate pyrenomycete, up to 0.7-0.8 microns in diam, covered by a
conspicuous white material? It was collected on the underside of a woody piece
(perhaps Salix).

The asci have a little refringent apparatus IKI and Melzer negative and the ascospores
(2-guttulate in H2O) have any germ slit (or it is very inconspicuous).

When I began to study it, my material was very damaged and for it I cannot do a good description but I see any dark peridial setae of Coniochaeta-type

Many thanks again
Enrique

Jacques Fournier, 26-09-2012 20:56

Re : Strange roundish pyreno

Hola Enrique,
I agree with you this likely a Coniochaeta. They don't all have conspicuous setae, you should check the ostiolar region in a crush mount, you may find small setae.
Regarding a possible species name I have no idea! Maybe Andy?
Good luck!
Jacques

Enrique Rubio, 26-09-2012 21:11

Re : Strange roundish pyreno

Thanks, Jacques.
But the spores have not conspicuous germ-slits as the typical Coniochaeta species!
I can't to study more the perithecia because they are dead

Andrew N. Miller, 26-09-2012 22:12

Re : Strange roundish pyreno

Probably a Coniochaeta, but what species I do not know.

Andy

Enrique Rubio, 27-09-2012 16:47

Re : Strange roundish pyreno

Thank you Jacques and Andrew

Peter Welt, 27-09-2012 19:52

Re : Strange roundish pyreno

Although I have no idea, but it can not be Coniochaeta because no three-dimensional spores.

Peter

Enrique Rubio, 27-09-2012 20:37

Re : Strange roundish pyreno

No, Peter. As you say, the spores are not three-dimensional

Björn Wergen, 29-11-2012 11:00

Re : Strange roundish pyreno

Hi Enrique,

your species reminds me somewhat of Boliniaceae, especially if you look at the spores on the left site (2guttulate, as you described). Arrangement in Asci is similar to that in C. microspora, for example. Only the apical apparatus does not fit to "Camarops". I do not know Boliniaceae very well but I think you should look there.

regards,
björn

Andrew N. Miller, 29-11-2012 16:37

Re : Strange roundish pyreno

Members of the Boliniales form perithecia imbedded in a stroma, not individual perithecia as in this specimen.

Andy

Björn Wergen, 29-11-2012 20:17

Re : Strange roundish pyreno

Ok, I thought Boliniales has members without a stroma. I have photos of Lentomitella cirrhosa and this one looks like as if there is no stroma (watch Alain's photo).

regards,
björn

Andrew N. Miller, 29-11-2012 20:35

Re : Strange roundish pyreno

Yes, you are correct. Lentomitella does not have a stroma, but it occurs in a large, diverse polyphyletic clade unofficially called "Ceratosphaeriales" sensu lato, near the Diaporthales, Ophiostomatales, and Chaetosphaeriales. It has nothing to do with the Boliniales.

Andy

Thomas Læssøe, 30-11-2012 15:53

Re : Strange roundish pyreno

I would not rule Xylariaceae out. There are many taxa that are not amyloid and the surface of these "perithecia" strongly resembles uniperitheciate stromata of various Xylariaceae. The spore shape is fine for Xylariaceae, less fine for Boliniaceae and Coniochaeteaceae. I do not have a species suggestion :-)

cheers

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